IPC with pipes, also dup2 redirect stream handle

#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

int main()
{
        int fds[2];
        pid_t pid;

        pipe( fds );
        pid = fork();
        if( pid == (pid_t)0 )
        {
                close( fds[1] );
                dup2(fds[0], STDIN_FILENO );
                execlp( "sort", "sort", 0 );
        }
        else
        {
                FILE *stream;
                close(fds[0]);
                stream = fdopen( fds[1], "w" );
                fprintf( stream, "This is a test.\n" );
                fprintf( stream, "Hello, world.\n" );
                fprintf( stream, "My dog has fleas.\n" );
                fprintf( stream, "My dream will come true.\n");
                fflush( stream );
                close( fds[1] );
                waitpid( pid, NULL, 0 );
        }
}